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Long-term Debt (Details) | 4 Months Ended | 6 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
May 03, 2018 USD ($) | Jun. 30, 2018 USD ($) | Jun. 30, 2017 USD ($) | Jul. 31, 2018 USD ($) | May 31, 2018 USD ($) | Feb. 28, 2018 USD ($) | Dec. 31, 2017 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |
Loan reference interest rate |  | LIBOR |  |  |  |  |
Repayments of debt |  | $ 108,722,000 | $ 5,190,000 |  |  |  |
Write off of unamortized issuance costs |  | (21,000) | (358,000) |  |  |  |
Cash and cash equivalents |  | 218,651,000 |  |  |  |  | $ 257,911,000
Restricted cash |  | $ 10,425,000 | $ 12,120,000 |  |  |  | 7,169,000
Weighted average interest rate |  | 5.40% | 4.58% |  |  |  |
8.30% 2022 Notes |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Unamortized deferred financing fees |  | $ 1,797,000 |  |  |  |  | 2,000,000
Not legally restricted |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Cash and cash equivalents |  | 52,463,000 |  |  |  |  | 51,359,000
Legally restricted |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Restricted cash |  | $ 21,845,000 |  |  |  |  | $ 15,589,000
NBG $30,000 Facility |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Initiation date |  | Apr. 19, 2018 |  |  |  |  |
Maximum borrowing capacity |  | $ 30,000,000 |  |  |  |  |
Maturity date |  | Dec. 31, 2022 |  |  |  |  |
Number of installments |  | 19 |  |  |  |  |
Frequency of payments |  | quarterly |  |  |  |  |
Date of first required payment |  | Aug. 31, 2018 |  |  |  |  |
Repayment installment |  | $ 950,000 |  |  |  |  |
Balloon installment |  | $ 11,950,000 |  |  |  |  |
Vessels provided as collateral |  | The NBG $30,000 Facility is secured by a first priority mortgage on the vessels previously pledged under Commerzbank $120,000 Facility (Star Aurora, Star Gamma, Star Delta, Star Epsilon, Star Theta and Star Iris) |  |  |  |  |
Line of credit facility, description |  | For the refinancing of the Commerzbank $120,000 Facility |  |  |  |  |
Commerzbank $120,000 Facilitiy |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Repayments of debt | $ 34,726,000 |  |  |  |  |  |
Write off of unamortized issuance costs | $ 21,000 |  |  |  |  |  |
DNB $310,000 Facility |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Initiation date |  | Apr. 30, 2018 |  |  |  |  |
Maximum borrowing capacity |  | $ 310,000,000 |  |  |  |  |
Vessels provided as collateral |  | The loan will be secured by a first priority mortgage on the vessels previously pledged under the refinanced facilities |  |  |  |  |
DNB $310,000 Facility | Tranche A |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Proceeds from issuance of debt |  | $ 240,000,000 |  |  |  |  |
Number of installments |  | 20 |  |  |  |  |
Frequency of payments |  | quarterly |  |  |  |  |
Repayment installment |  | $ 8,696,000 |  |  |  |  |
Balloon installment |  | $ 66,087,000 |  |  |  |  |
Line of credit facility, description |  | The tranche of $240,000 will be used to refinance the remaining aggregate outstanding amount under the ABN $87,458 Facility, the DNB-SEB-CEXIM $227,500 Facility, the DNB $120,000 Facility, the Deutsche Bank AG $39,000 Facility and the ABN AMRO Bank N.V. $30,844 Facility, respectively. |  |  |  |  |
DNB $310,000 Facility | Tranche B |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Proceeds from issuance of debt |  | $ 70,000,000 |  |  |  |  |
Number of installments |  | 12 |  |  |  |  |
Frequency of payments |  | quarterly |  |  |  |  |
Repayment installment, percentage |  | 5.55% |  |  |  |  |
Line of credit facility, description |  | The tranche of $70,000 will be used for working capital purposes. |  |  |  |  |
ING $45,000 Facility |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Initiation date |  | Apr. 30, 2018 |  |  |  |  |
Maximum borrowing capacity |  | $ 45,000,000 |  |  |  |  |
Number of installments |  | 28 |  |  |  |  |
Frequency of payments |  | quarterly |  |  |  |  |
Repayment installment |  | $ 937,500 |  |  |  |  |
Balloon installment |  | $ 18,750,000 |  |  |  |  |
Vessels provided as collateral |  | The facility will be secured by a first priority mortgage on the vessels previously pledged under the refinanced Deutsche Bank $85,000 Facility. |  |  |  |  |
Line of credit facility, description |  | The "ING $45,000 Facility" will be used to refinance the outstanding amount under the Deutsche Bank $85,000 Facility. |  |  |  |  |
Citi $130,000 Facility |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Initiation date |  | Apr. 30, 2018 |  |  |  |  |
Maximum borrowing capacity |  | $ 130,000,000 |  |  |  |  |
Number of installments |  | 20 |  |  |  |  |
Frequency of payments |  | quarterly |  |  |  |  |
Repayment installment |  | $ 3,650,000 |  |  |  |  |
Balloon installment |  | $ 57,000,000 |  |  |  |  |
Vessels provided as collateral |  | The Citi $130,000 Facility will be secured by a first priority mortgage on the vessels previously pledged under the refinanced Citi Facility and the 5 applicable Augustea Vessels. |  |  |  |  |
Line of credit facility, description |  | The "Citi $130,000 Facility" will be used to refinance in full the approximately $65,000 outstanding under the Citi Facility and provide approximately $65,000 to refinance the existing indebtedness of five of the Augustea Vessels. |  |  |  |  |
CreditAgricole $43,000 Facility |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Initiation date |  | Jun. 30, 2018 |  |  |  |  |
Maximum borrowing capacity |  | $ 43,000,000 |  |  |  |  |
Number of installments |  | 20 |  |  |  |  |
Frequency of payments |  | quarterly |  |  |  |  |
Repayment installment |  | $ 625,000 |  |  |  |  |
Balloon installment |  | $ 9,000,000 |  |  |  |  |
Vessels provided as collateral |  | The facility will be secured by the two vessels previously securing the Credit Agricole $70,000 Facility. |  |  |  |  |
Line of credit facility, description |  | The "Credit Agricole $43,000 Facility" will be used to refinance the outstanding amount under the Credit Agricole $70,000 Facility. |  |  |  |  |
Number of loan tranches |  | 2 |  |  |  |  |
Restructuring Letter Agreements |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Prepayment amount |  |  |  | $ 22,723,000 | $ 30,000,000 | $ 35,632,000 |

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